iMac Intel 21.5" EMC 2389 Logic Board Replacement

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Be careful not to touch any solder joints on the back of the power supply. Capacitors may be charged enough to give you a dangerous shock.
Remove the following four screws:
One 9.3 mm T10 coarse-threaded screw
One 25 mm T10 coarse-threaded screw
Two 22 mm fine-threaded screws
Pull the upper right and lower left corners of the power supply away from the rear case to dislodge the mounting posts attached to the power supply's corners.

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